Process of dyeing.



salts-1 ;Th'e' favorable action of -thesejcoma poundss'ems to be due tothe factt'hat 'the' ammonium? salts. neutralize the" free alkalipresent in the dyebaths containing 'sulfids' UNl'lED STATES PATENT 'OEFICE.

HANS zron rnn, OF .ELBEBFE LD-, GERMANY, ASSIGNOR'TO FA-RBENFABRIKEN VORM. FRIEDR. BAYER &.c0., OF ELBEBFELD, GERMANY, AICORPORATION-OF GERMAN Y.

rnocsss OFEDYEING.

silo. 873,636.

To-allwh'o'm comm:

Be it known that. I, HANS .ToEPFiiR citi- 'zen-of the Qerman Emp'ire, residing at Iilberfeld, Germany, Kingdom of Prussia, "have. invented new and useful Im rove'npents in Processes ofjDyeing; of thhioh-t 'eifollowing'is a'specification,

,As isknown, the sulfur dyestufis show the disadvantageof'dyeing uneven shades.

' I have not; discovereda new process for dyemg' the fw'regetable fiber with sulfur-polor ng'matte'rs'which process avoids" in a very simple manner the -above-mention'ed disadvantage.

the usual alkaline sulfids' with'the' addit on of ammonium o'f alkaiies; Level-and uniform shades are thus produced. 1 Itris worthy of note that in many cases the-shades are deeper and faster to washing than those obtained'without: theemployment'oi' amr'noniiunfsalts. An addition'of soap, especially soft soap, is. often advantageous. v

'j The'new' processjs-also adapted for machine dyeing Thefolldwing example may illustrate myinventiomithe partsbeingib'y weight: A'dye-- bath is prepared from 2090 parts of water,

parts of Katigen indigo'B extra 30. parts of Snecificati'on of Letters Patent. mama; mm m 24.1906. Serial No. "327,552.

. or at the ordinary temperature;

fwltnesses.

Patented Dec. 10, 1907.

(:rystalliz'edsulfid. of sodium, 8 parts of cal- -emed sodium carbonate, 40 parts of Glauhersalt, and 4 parts of soft soap. To this dyebatlnikhlated to degrees C., 3' parts of carbonate are added. The bath at once; assumes tl yellow color of the vat.

ammoniu 100 parts of cotton yarn are then-dyed in this bath at-30 degrees Q'for one hour,- taking care that thematerial is alt'vays covered by the; liquid. The dyed goods are s ueezed out, exposedl to the-air, and well rinsed.

- Ammoniumcarbona'te can-be replaced By otl-ier ammonium salts, such as arm: unlum :chlorid', ammonium sulfate, etc; The dye- .The"neu' t process consists in carrying out the'dyeing 'of the vegetablefiber with sulfur 'dyes inbaths -'conta ini ing'lcan also bedone at a higher temperature On aceount,

ofthevolatility of ammonium sulfid formed now describedmy invention and in what manner'the same .is tobe'performe'd, -'what'Icla 1m, 1s:

'-"1h hereimdescribed'hrocess for dyeing fids and ammonia, substantially as described.

In testimony whereof-I have hereunto set m hand in the presence of'twosubsc'rioing -,HANS 'TO'EPFER.

Witnesses:

J; A. Rl'l-TERSHAUS, FBI. Roman.

in the bath it is advantageousto'dye at a moderatetemperature-.- Of course, other sul dyestufis may-be used. 

